1) Knowing vocabulary, especially academic vocabulary, is essential for successful reading in a second language. Vocabulary knowledge contributes more to reading comprehension than other linguistic factors like grammar.
2) Guessing the meaning of unknown words from context has limitations and is not a reliable strategy for real reading. It can lead to frustration and incorrect guesses.
3) Looking up unknown words using a dictionary, especially electronic bilingual dictionaries, improves both vocabulary learning and reading comprehension. Students should be taught effective dictionary skills.